I have xml A and xml B. Where A and B has no similarities or relationship with each other. i want to combine/append xml B to xml A. Is there a way of doing this. If so, how would I extract A and B from the file I combine A and B to?

I'm trying to create a simple type that holds two different types. The first is IDREF and the second is an enumeration of string. When I generate a sample xml, I can enter any ID previously stated in the xml and validates correctly. When I try to use one of the enumeration in the drop down list, the xml will not validate.
When I validate the xml in xmlspy, i get the error message "IDREF 'endofprogam': referenced ID 'endofprogam' was not...